[balloon-makers] 1/2 inch seams

skyfun at ncia.net skyfun at ncia.net
Mon Apr 23 11:27:41 CDT 2001

With the proper tools darn near any schmuck can make good 1/2" seams.... I know since I am one of those schmucks. 
All that is necessary is to take some of your fabric to a good sewing machine shop such as Augers & Sons in Rchester NH, tell them you want a folder for a 1/2" seam or whatever size you want and they will have one made for you at some secret attachment makers place. Works great and the price was reasonable. It is a lot easier than trying to fold it by hand.

> From: Keith Sproul <ksproul at rci.rutgers.edu>
> To: balloon-makers at deering.org
> Date: Mon, 23 Apr 2001 12:58:17 -0400
> Subject: Re: [balloon-makers] 1/2 inch seams
> It is amazing how much difference 1/4" can make..  To make 1/2" 
> seams, you would need a 3/8" gauge sewing machine.  Jon R. has a 3/8" 
> machine.  This is the SMALLEST recommended gauge to use for balloons.
> I agree, 1/2" seams would be REAL tough to get consistent until you 
> have had a lot of experience.. (aka Micki)
> Keith
> At 10:50 -0400 4/23/01, Tom Deering wrote:
> >I did a comparison of two envelopes.  One with 1/2 inch seams, and 
> >one with standard 3/4 inch seams. Given the same limited fabric 
> >width, the envelope with the 1/2 inch seams can be made 1,149 cu ft 
> >larger, and will lift 21 lbs more.
> >
> >Assuming you make the gores the full width of your fabric, it would 
> >be possible to make the half-gores 1/2 inch wider, and create a 
> >larger envelope.  That doesn't seem like much, but multiplied by 32 
> >half gores, it adds up.
> >
> >These numbers, by the way, are for a vertical gore balloon.  The 
> >fabric lost within the seams of a horizontal gore balloon is much 
> >greater, so the difference would be even more pronounced.
> >
> >Could I make good 1/2 inch seams?  I don't think I could.  But it is 
> >interesting to see how that little 1/4 inch changes the design.
> >
> >Cheers,
> >
> >Tom
> >---
> >Please do not assume I know what I'm talking about.  Pretend I know 
> >nothing.  It works for my wife. -------
> >This list is archived at http://www.hombc.org/balloon-makers
> Keith Sproul	ksproul at rci.rutgers.edu		WU2Z
> Student Housing Network Coordinator		732 445-3695 W
> Rutgers University Computing Services
> -------
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